【答案解析】Nowadays with the development of tourism, air travel is becoming more and more popular. First, with its high speed, air travel can save a lot of time. Second, compared with train travel, it"s more comfortable because the plane flies so smoothly that people can have a good rest during the trip, while the train is sometimes too crowded to have a seat. However, train travel also has its own advantages. For example, traveling by train is money-saving and safer. Besides, it"s unlikely to be influenced by the weather. Since every coin has two sides, different people may like different ways of traveling.